Two days ago, while surfing the net, I happened to come across a guy who ported the ZX Spectrum Next core to the Nexys A7 100T board in a very first version.
I'm in contact with him since then and I'm also testing the core here on my Nexys board. Except for a few "very minor problems", it really works quite well already.
I have already tried a first NextBASIC test program, it works quite well.
Using the Next also CP/M 3.0 works.
All in all, the Nexys board now can run the ZX Spectrum Next core in addition to the MEGA65 core. So you have two new "8bit computers" in one.
Here are a few photos I just took from my Nexys board running the current Next core: